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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '338f54d86a64ed4a968ef30231c3b6ba652657e36be38ff4be93cb6d1aa6c502' 
  AND token = 'rcPRqQH4a1LP5dpAXY2l2ebM5I0EZOiD66iseNWHOBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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