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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd3f95a7a719cd28f74ba049b57fcfc218ecadf3fec570c89640ab9d6a36b847' 
  AND token = 'mex3fdoGCIosR1M7Kbb09NUfKmwTjenYAb4/ME+Wpgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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