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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7be09ec033437c726e88689bc2319ce9ece02b1197a4235097e66f4a06f9064a' 
  AND token = 'SnR6ldB4VaYIMQ3yh13OQhM2QxxsDfd9IAvPdLwSokQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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