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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28fdd4f3ba6e80c55c6e822e4a02f0c91de96da9e6c59c75a058353196c3e40d' 
  AND token = '1MM6q/3ziLEfx46RDUgPyopJz+4jTzlPRNaKQzi5MUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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