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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '491a255841c8a1e8374267673fa7733a864719f6ad5429b4818de04a00a693ac' 
  AND token = 'Lx3exERc4GqM5ogzYr5iGpQ/mwwBGUx9pdHrGauz9qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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