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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25413b8f4d65ae3091e5139064c7f831a6d49f6cab7d0d65020ada7f67095d40' 
  AND token = '+myZjd0fImEIQK7lbKIL3qEMEak+QOI80IDyVi4dLhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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