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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '792c04c70b0b7ef4810f2d675a5d8b506831aa4620bdc7474217bf2651bed924' 
  AND token = 'GK6HT9Wk4o5AYk/Z9B2WeDh5dWD/0Tro8nAdgSADfiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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