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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '281175b9569d4a7c091bf1d597969e5b31c4ea236d7dae1e2f956d0426ecb8b6' 
  AND token = 'nVait57me2rkdhEJDRd8anPwDAEnzhjcC23qP1La/aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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