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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4410d00db0ac1bdcbe034d8eb4c6abc626c1c25364199badf45ea489bf65601d' 
  AND token = 'FlJF/GU05rtpaUlIL5VGl9vUvIAkEGGLw9rEGDWeYU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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