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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79502194544b9b598842b26691c6c3a0445597a106aef9c472d1fd3c2e27f978' 
  AND token = 'M2KzIUXv4rdta0b+NdtmmJ9Zl3RCg30iCDfN4rILNWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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