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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71ef5410c5a802053fe7a8eaaac937d6c424a58f793bd281e74aa390cb69180e' 
  AND token = '2cw0tzhZ/lDPolVaw7S06TNBgV5WQK3wZkr0hVfdbeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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