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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58d6f35e0839693fb94c2e8ef3a28f2bb8960eecb0556b08bdeb788d997ef3ae' 
  AND token = 'TBRNxirryXqi7eNGWS/6Cr5lYnMjCdYpHkYi4t3FVuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}