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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed9ec45a6a51d5ae4a1e1d3d61a8a9836563d020f705760b36678449c1cf7357' 
  AND token = 'tXPz5quOZFoRfZCPezxun/fchw4zWKxXs63q3E7ABP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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