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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a15ce04dd9bbce38bc1cefaa17bed44c6a6347d473293830b759f5cc13e14c86' 
  AND token = '3D2k32RBFdQGrYrCLwEfm+6mjvrfrK62KN5yMoISYyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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