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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba376f4c7791f8b9ff6ac587bf7ea4ce6070319ab6c6f89056465586cfeab88d' 
  AND token = '2cu1DcIVp8+yaKPiui05tbZ80tox91FEQc5MYGPywL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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