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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a154e3cc3d94918c50af28f0069ed4ae13394068d7fdd32307f5cdad0fc2e45d' 
  AND token = 'oj31Rz/L/UHyHg9sp0IHd12NWjh8LerwcbzZjTDmKrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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