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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ba0e3a62924d5e61115fc8237bcdf0fbbdfab01a90b2e2dc5d68b8f8f3632de' 
  AND token = '/3RtL5fwIATZhVZDeTHK2S0cE1UVbblLVfn4hz5kjBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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