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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '347d44346371c3f8878a7ef1f2aa4bc619b70027ac9d1c6b6cd5523bf5aa8796' 
  AND token = 'ulSvopsmKPlT10yAs6Ax1cNz2SryQ96K5KY5zq9Ci8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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