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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '152cb79e9abf1d232a4731828bff8b1b2d5bee9fcceb80a7b0f58fe3554a51a5' 
  AND token = '97GoTTTtemS+awOVPjAJvhB+cPyLxstt9WU1xPmI+Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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