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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a8aeffaced7c571a9c1437261ab5b86c4394f1777a74d8a20aa6d77b880202' 
  AND token = 'r/ts85/yNaOFZmITdsMwxeyJkF8AT3Of5C9jhBFEhKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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