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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c13984fa637d441ab57abb1d6e665681f27aee16666d93aaa0b3a07146cba440' 
  AND token = '4RngjdH4/TB9czQBBcDZ2z04v5zVQbPv60zxMqJWTm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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