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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c880e6cd6dc2f32eba41e2d81f8515888c3fd35d0eee2d56a11b84a2c0ce66cd' 
  AND token = 'ROHtjZCZJQb1PvjdrYqLVk8vTsTs5cvCH8NSNQvZcfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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