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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10446f12ff8b967e752082a64a945c597dbb0db97d6ba604bf3466d055733ed0' 
  AND token = 'EtcLN9ip7aCBh7uI45zhEfJjqMfQeisD3qhWIAntOWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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