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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f81679c1498ee09efb80e776cd7338cf28e0893d25c435cbbc1100dd31d4860' 
  AND token = 'kuTLRVDfQa2Yv8qzPCUk4MYG8PLOAUXKIEONek1J9ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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