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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ad6c8e258c8cd5df703e3a365dd95d4530e22e4f1e7b369295f2e4fb758f1ff' 
  AND token = 'rTpB2caVgZM42wgDMXAPvKb2j5n1seci1cooDyY9Tkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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