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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9463c06025e30017099c1e2d1bf1c77bfe20f7899a87f46f212d25f6a417f8e9' 
  AND token = 'TEUCZgD81d4rV66SdwRdqHTiLbmTh8y4TQ1NKczVS/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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