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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe849a4ad771124ed2dc9eed2d88aadc1353030a93c098d20312ac054fe5834e' 
  AND token = 'tebjSUzElv2XSG1/m91rPQi6es4sMp92twiqNXKRRwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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