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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0363ce0b459290288ca1e1aa2e1f6b932176d740ae2cb2c3f7a230a7283648c3' 
  AND token = '7TLheYfMyzaovWy2qNdOcGqIP1ah/oSMqRlu+5Iz+Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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