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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8398a26c3b8ea19e3d1b67bc0225726b3c49fd9f74a122bf55684d6f4d85fabf' 
  AND token = 'xYARwNsk424TK14IpFGCStpNMTe521JT2WH0VO3Px5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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