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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83811ac329e559cea8a78d179a5f8ddeaac95705396c57895ab6879a9fbc7aab' 
  AND token = 'BhJAJsoiTQw/BIm1v2A+eYzdOFpiTLtekc1oBjC2WhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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