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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f0acd3777e9dfc10fd6e56544710e1cad66435da3384900d4424d03bdb85e92' 
  AND token = '+XMuH9oIV/X49l0sLMoEX6Y7j/k+hR96vqL3Sk3tg6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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