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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd25bd853408ea0b07a8945b0c3bff35a9cb1b2770e79ecf276cd12c698061261' 
  AND token = 'CevKf0FRqVMuZn3dN0Oa46Mvl2c+1qpQQt20mokm3IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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