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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2628b91e7fd8df7d3622af8077b999e54850862dbdd6cad06a8a4d4b045780cb' 
  AND token = 'VqZWPUqkzMDts9DQMd3f7kLQhl2ALU21izpiN9JxJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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