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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42f8679246b40da0d1b1188a2c00122376aafcc630ead85fd238d86aa9dcfdc2' 
  AND token = 'apRIhroMUc6Iy6CCZnOSKNnMiVbmFEPBb7eI18dvWgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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