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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '871e8fc2bc27fe8819d66ff1874ce1cb0f8378649bea248384ad820ef7bb48c9' 
  AND token = '4Yeum9dXqFivmivqq//fGr1paYkKzNWW9lArVtY2rYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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