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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50680827cc1ecad56ab0ad015b97581c605916a86b8cf4008c8bc5ccd1159747' 
  AND token = 'tR0fHTjj10290wL1HIkzRsQ8Qc/7fSDnDhTSWP0l9qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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