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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f54e91e116cd5e1887077ee66f49845ccf0c44a5eca9c57f2e4e2217df2f76c0' 
  AND token = '/1xqutfgnBqCchvwfaNnnX2mTzwEgiSeR/tq4DFbFvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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