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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5e040e625306b5e6d0eb0f95d11a830857a3fb65afd3aebe84d09a4b87daeed' 
  AND token = '+xQ/7791hOecwrk1SyJrCNKaMTkbYb98asTIyzAAmXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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