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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaff4a344b4cf9882b795e881a6e76d7275aed2b825e0a22364549bb5850b593' 
  AND token = 'k6HbJwlz1zbHQgnrDFKet11d7XB7JkVVAoha7UCsEys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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