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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7987b7cc16ed1237f85dc4d8ff64847953c35150781cda2954ce10c45d161ba9' 
  AND token = 'zEKZtcV0KuNjt3ofqakADaZlse7HMxDE1t8byXPRrQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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