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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bd142ee3e69dfa96e305f6d08d7f6460ec2080e6f6ea8008e4cfd7e264d73a6' 
  AND token = 'q2HIch6s9KOFkl3f3Tl3OHCKK4d4YfdiZOh9qlfDC/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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