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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '652aa9de6b99e547c842b41ec9f19adfdcf69748120ec1e69cf22d2e1ee3c6ba' 
  AND token = '3jGOtZi4eAAPeIboYc2VRwlHG6Gkacj+KjiaTIl8FSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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