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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5859c51455879ce2c1e7abf40d7bf1d5e1be752a940a0b8bac6b79c720dd79cd' 
  AND token = 'VhT3Kjkt/Y/lHWBt6Za7+VrDiKM6t0QuE1qD+2A0sis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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