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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '674bd90660331c5bac8f53fa3950b0583f102571f7122b1a3695cb8614226d12' 
  AND token = '7o5tVwev3b+k312oAebtjHecWk0u/aOMqHpVA7n7WyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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