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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1457e79bf8dd4ceee26aeff8cbe5bb533951fa549bbe347cfb6adce8e0df1e55' 
  AND token = 'fpoWdsHHF6fI5uCVQmrenPFmOAMf4gnyektDe2SEhJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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